Question about 2001 Mercury Mountaineer

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Engine runnig rough, check engine lighy on, when going 60 mph light starts flashing.

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A solid light can mean anything from a loose/faulty gas cap to a transmission issue. The flashing light means your engine is misfiring and this can cause serious damage to the engine. A misfire can be caused by anything from a bad spark plug, to a bad fuel supply.

This light comes on when the computer detects a fault of some sort in its diagnostic tests. If it keeps detecting this issue, the light will remain on. If the light turns off, then it has detected that the issue may no longer be present.

In order to find out what the exact reason was for your light, You need to have your car computer scanned to retrieve the code that the computer would have stored when the light triggered. Most garages will do this free of charge. The code will tell you what may have caused the light to initially turn on. Until you get this code, it's impossible to determine what parts need to be checked or replaced.

Posted on Oct 08, 2009


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